diff --git a/Auto_Seat.ino b/Auto_Seat.ino
index 051b99d..929ba81 100644
--- a/Auto_Seat.ino
+++ b/Auto_Seat.ino
@@ -515,7 +515,7 @@ void updateDebugOutput(unsigned long currentTime) {
 
   if (lastDebugPrintTime == 0 || currentTime - lastDebugPrintTime >= DEBUG_INTERVAL_MS) {
     lastDebugPrintTime = currentTime;
-    printStatus(F("DEBUG"));
+    printDebugLine();
   }
 }
 
@@ -625,50 +625,65 @@ void printStatus(const __FlashStringHelper *tag) {
   printAutoCalibrationDelayStatus();
 }
 
-void printUptime() {
-  unsigned long totalMs = millis();
-  unsigned long hours = totalMs / 3600000UL;
-  totalMs %= 3600000UL;
-  unsigned long minutes = totalMs / 60000UL;
-  totalMs %= 60000UL;
-  unsigned long seconds = totalMs / 1000UL;
-  unsigned long milliseconds = totalMs % 1000UL;
-
-  Serial.print(F("uptime="));
-  Serial.print(hours);
-  Serial.print(F("h "));
-  Serial.print(minutes);
-  Serial.print(F("m "));
-  Serial.print(seconds);
-  Serial.print(F("s "));
-  Serial.print(milliseconds);
-  Serial.println(F("ms"));
+void printDebugLine() {
+  Serial.println();
+  Serial.println(F("[DEBUG]"));
+  printUptime();
+  printNamedInt(F("raw"), parkingRawValue);
+  printNamedBool(F("ig"), ignitionState == HIGH);
+  printNamedBool(F("p"), parkingState == HIGH);
+  printNamedBool(F("rawDrive"), getRawDriveMode() == HIGH);
+  printNamedBool(F("confirmedDrive"), confirmedDriveMode == HIGH);
+  printNamedLong(F("currentMs"), currentPosMs);
+  printNamedLong(F("targetMs"), targetPosMs);
+  printNamedInt(F("savedMs"), storedSeatPositionMs);
+  printNamedInt(F("hardLimitMs"), SEAT_HARD_LIMIT_UP_MS);
+  printNamedInt(F("requestedRelay"), requestedSeatAction);
+  printNamedInt(F("actualRelay"), currentSeatAction);
+  printNamedBool(F("manual"), manualMode);
+  printNamedBool(F("stabilizing"), isStabilizing);
+  Serial.print(F("useCount="));
+  Serial.print(useCount);
+  Serial.print(F("/"));
+  Serial.println(USES_BEFORE_AUTO_CALIBRATION);
+  printNamedBool(F("autoPending"), autoCalibrationPending);
+  printNamedBool(F("forceCal"), forceCalibration);
+  printNamedInt(F("autoCalState"), autoCalibrationState);
+  printAutoCalibrationDelayStatus();
 }
 
-void printAutoCalibrationDelayStatus() {
-  if (useCount < USES_BEFORE_AUTO_CALIBRATION) {
-    return;
-  }
-
-  Serial.print(F("autoCalOffTimer="));
-  if (ignitionState == HIGH) {
-    Serial.println(F("waiting_for_ig_off"));
-    return;
-  }
-
-  unsigned long elapsedMs = millis() - ignitionOffStartTime;
-  unsigned long remainingMs = 0;
-  if (elapsedMs < AUTO_CALIBRATION_DELAY_MS) {
-    remainingMs = AUTO_CALIBRATION_DELAY_MS - elapsedMs;
-  }
-
-  Serial.print(F("elapsed "));
-  printDuration(elapsedMs);
-  Serial.print(F(" remaining "));
-  printDuration(remainingMs);
+void printUptime() {
+  Serial.print(F("uptime="));
+  printDuration(millis());
   Serial.println();
 }
 
+void printUptimeInline() {
+  Serial.print(F("uptime="));
+  printDuration(millis());
+}
+
+void printBool(bool value) {
+  Serial.print(value ? F("true") : F("false"));
+}
+
+void printNamedBool(const __FlashStringHelper *name, bool value) {
+  Serial.print(name);
+  Serial.print(F("="));
+  printBool(value);
+  Serial.println();
+}
+
+void printNamedInt(const __FlashStringHelper *name, long value) {
+  Serial.print(name);
+  Serial.print(F("="));
+  Serial.println(value);
+}
+
+void printNamedLong(const __FlashStringHelper *name, long value) {
+  printNamedInt(name, value);
+}
+
 void printDuration(unsigned long totalMs) {
   unsigned long hours = totalMs / 3600000UL;
   totalMs %= 3600000UL;
@@ -687,6 +702,38 @@ void printDuration(unsigned long totalMs) {
   Serial.print(F("ms"));
 }
 
+void printAutoCalibrationDelayStatusInline() {
+  if (useCount < USES_BEFORE_AUTO_CALIBRATION) {
+    return;
+  }
+
+  Serial.print(F(" autoCalOffTimer="));
+  if (ignitionState == HIGH) {
+    Serial.print(F("waiting_for_ig_off"));
+    return;
+  }
+
+  unsigned long elapsedMs = millis() - ignitionOffStartTime;
+  unsigned long remainingMs = 0;
+  if (elapsedMs < AUTO_CALIBRATION_DELAY_MS) {
+    remainingMs = AUTO_CALIBRATION_DELAY_MS - elapsedMs;
+  }
+
+  Serial.print(F("elapsed "));
+  printDuration(elapsedMs);
+  Serial.print(F(" remaining "));
+  printDuration(remainingMs);
+}
+
+void printAutoCalibrationDelayStatus() {
+  if (useCount < USES_BEFORE_AUTO_CALIBRATION) {
+    return;
+  }
+
+  printAutoCalibrationDelayStatusInline();
+  Serial.println();
+}
+
 void setRelay(int relayPin, boolean state) {
   digitalWrite(relayPin, state ? LOW : HIGH);
 }
diff --git a/README.md b/README.md
index ae17a38..ede3007 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,29 @@ If IG1 is still ON:
 autoCalOffTimer=waiting_for_ig_off
 ```
 
+Debug mode prints a readable block every second, one item per line. Boolean values are printed as `true` or `false`:
+
+```text
+[DEBUG]
+uptime=0h 0m 5s 123ms
+raw=1023
+ig=true
+p=true
+rawDrive=false
+confirmedDrive=false
+currentMs=0
+targetMs=0
+savedMs=6000
+requestedRelay=0
+actualRelay=0
+manual=false
+stabilizing=false
+useCount=0/10
+autoPending=false
+forceCal=false
+autoCalState=0
+```
+
 ## Automatic Calibration
 
 - Each `IG1 HIGH -> LOW` transition increments the EEPROM use counter.
diff --git a/report.html b/report.html
index 9ded4c0..d977968 100644
--- a/report.html
+++ b/report.html
@@ -226,6 +226,7 @@ when currentPosMs <= 0:
     <p><span class="warn">주의:</span> 명령은 한 글자만 받습니다. <code>debug</code>, <code>down</code>, <code>position 2000</code>처럼 긴 문자열은 실행하지 않습니다.</p>
     <p>모든 상태 출력에는 부팅 후 경과 시간이 <code>uptime=0h 2m 13s 457ms</code> 형식으로 포함됩니다. debug 출력에서도 1초마다 같은 형식으로 확인할 수 있습니다.</p>
     <p>사용 횟수가 10회에 도달한 경우에만 보정 대기 타이머가 <code>autoCalOffTimer=elapsed 0h 1m 20s 123ms remaining 0h 3m 39s 877ms</code> 형식으로 추가 출력됩니다. IG1 ON 상태에서는 <code>autoCalOffTimer=waiting_for_ig_off</code>로 표시됩니다.</p>
+    <p>debug 출력은 1초마다 항목별 한 줄 형식으로 표시되며, <code>ig=true</code>, <code>p=false</code>, <code>autoPending=false</code>처럼 bool 값은 <code>true</code>/<code>false</code>로 출력됩니다.</p>
 
     <h2>5. 수동 위치 세팅 시뮬레이션</h2>
     <table>