diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0f7fd1..5fe2255 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Change Log
 
+## [Unreleased]
+- Fix peripheral inheriting size, accessType and resetValue from device
+
 ## [v1.6.0] - 2025-08-30
 - PR[#11](https://github.com/mcu-debug/peripheral-viewer/issues/11): An alternative way to load peripherals information (see [extending-peripheral-viewer.md](https://github.com/mcu-debug/peripheral-viewer/blob/main/docs/extending-peripheral-viewer.md))
 
diff --git a/src/svd-parser.ts b/src/svd-parser.ts
index 9501229..9fa7e8b 100644
--- a/src/svd-parser.ts
+++ b/src/svd-parser.ts
@@ -473,12 +473,16 @@ export class SVDParser {
             name: p.name[0],
             baseAddress: parseInteger(p.baseAddress ? p.baseAddress[0] : '0'),
             description: this.cleanupDescription(p.description ? p.description[0] : ''),
-            totalLength: totalLength
+            totalLength: totalLength,
+            // initialize from device-level defaults
+            accessType: _defaults.accessType,
+            size: _defaults.size,
+            resetValue: _defaults.resetValue
         };
 
         if (p.access) { options.accessType = accessTypeFromString(p.access[0]); }
-        if (p.size) { options.size = parseInteger(p.size[0]); }
-        if (p.resetValue) { options.resetValue = parseInteger(p.resetValue[0]); }
+        if (p.size) { options.size = parseInteger(p.size[0]) ?? options.size; }
+        if (p.resetValue) { options.resetValue = parseInteger(p.resetValue[0]) ?? options.resetValue; }
         if (p.groupName) { options.groupName = p.groupName[0]; }
 
         const peripheral = new PeripheralNode(this.gapThreshold, options);
diff --git a/src/views/nodes/peripheralnode.ts b/src/views/nodes/peripheralnode.ts
index dbf9701..b638386 100644
--- a/src/views/nodes/peripheralnode.ts
+++ b/src/views/nodes/peripheralnode.ts
@@ -49,7 +49,7 @@ export class PeripheralNode extends PeripheralBaseNode {
     public readonly description: string;
     public readonly groupName: string;
     public readonly totalLength: number;
-    public readonly accessType = AccessType.ReadOnly;
+    public readonly accessType: AccessType;
     public readonly size: number;
     public readonly resetValue: number;
     protected addrRanges: AddrRange[];
@@ -65,6 +65,7 @@ export class PeripheralNode extends PeripheralBaseNode {
         this.description = options.description;
         this.groupName = options.groupName || '';
         this.resetValue = options.resetValue || 0;
+        this.accessType = options.accessType || AccessType.ReadOnly;
         this.size = options.size || 32;
         this.children = [];
         this.addrRanges = [];