diff --git a/subsys/logging/frontends/log_frontend_stmesp.c b/subsys/logging/frontends/log_frontend_stmesp.c
index e1d3a7a7e8b..4042fac853c 100644
--- a/subsys/logging/frontends/log_frontend_stmesp.c
+++ b/subsys/logging/frontends/log_frontend_stmesp.c
@@ -33,6 +33,10 @@ BUILD_ASSERT(sizeof(void *) == sizeof(uint32_t));
 	stmesp_data8(reg, data, timestamp, marked,                                                 \
 		     IS_ENABLED(CONFIG_LOG_FRONTEND_STMESP_GUARANTEED_ACCESS))
 
+#define STM_D16(reg, data, timestamp, marked)                                                      \
+	stmesp_data16(reg, data, timestamp, marked,                                                \
+		      IS_ENABLED(CONFIG_LOG_FRONTEND_STMESP_GUARANTEED_ACCESS))
+
 #define STM_D32(reg, data, timestamp, marked)                                                      \
 	stmesp_data32(reg, data, timestamp, marked,                                                \
 		      IS_ENABLED(CONFIG_LOG_FRONTEND_STMESP_GUARANTEED_ACCESS))
@@ -211,18 +215,72 @@ static int early_package_cb(const void *buf, size_t len, void *ctx)
 
 static inline void write_data(const void *data, size_t len, STMESP_Type *const stm_esp)
 {
-	uint32_t *p32 = (uint32_t *)data;
+	const uint8_t *p8 = data;
+	const uint32_t *p32;
+	uint32_t unaligned;
 
+	if (!len) {
+		return;
+	}
+
+	/* Start by writing using D8 or D16 until pointer is word aligned. */
+	unaligned = (uintptr_t)data & 0x00000003UL;
+	if (unaligned != 0) {
+		unaligned = 4 - unaligned;
+		unaligned = MIN(len, unaligned);
+
+		len -= unaligned;
+
+		switch (unaligned) {
+		case 3:
+			STM_D8(stm_esp, *p8++, false, false);
+			STM_D16(stm_esp, *(uint16_t *)p8, false, false);
+			p8 += sizeof(uint16_t);
+			break;
+		case 2:
+			if (len) {
+				STM_D16(stm_esp, *(uint16_t *)p8, false, false);
+				p8 += sizeof(uint16_t);
+			} else {
+				/* If len 0 then it means that even though 2 bytes are
+				 * to be copied we can have address which is not aligned
+				 * to 2 bytes.
+				 */
+				STM_D8(stm_esp, *p8++, false, false);
+				STM_D8(stm_esp, *p8++, false, false);
+			}
+			break;
+		default:
+			/* 1 byte to align. */
+			STM_D8(stm_esp, *p8++, false, false);
+		}
+	}
+
+	p32 = (const uint32_t *)p8;
+
+	/* Use D32 to write as much data as possible. */
 	while (len >= sizeof(uint32_t)) {
 		STM_D32(stm_esp, *p32++, false, false);
 		len -= sizeof(uint32_t);
 	}
 
-	uint8_t *p8 = (uint8_t *)p32;
-
-	while (len > 0) {
-		STM_D8(stm_esp, *p8++, false, false);
-		len--;
+	/* Write tail using D16 or D8. Address is word aligned at that point. */
+	if (len) {
+		p8 = (const uint8_t *)p32;
+		switch (len) {
+		case 2:
+			STM_D16(stm_esp, *(uint16_t *)p8, false, false);
+			p8 += sizeof(uint16_t);
+			break;
+		case 3:
+			STM_D16(stm_esp, *(uint16_t *)p8, false, false);
+			p8 += sizeof(uint16_t);
+			/* fallthrough */
+		default:
+			/* 1 byte to align. */
+			STM_D8(stm_esp, *p8++, false, false);
+			break;
+		}
 	}
 }