1 files changed, 6 insertions, 0 deletions
diff --git a/src/peripherals/usart.spec.ts b/src/peripherals/usart.spec.ts
index 2728f9c..c1e1570 100644
--- a/src/peripherals/usart.spec.ts
+++ b/src/peripherals/usart.spec.ts
@@ -150,6 +150,7 @@ describe('USART', () => {
       cpu.writeData(UCSR0B, UDRIE | TXEN);
       cpu.data[SREG] = 0x80; // SREG: I-------
       usart.tick();
+      cpu.tick();
       expect(cpu.pc).toEqual(PC_INT_UDRE);
       expect(cpu.cycles).toEqual(2);
       expect(cpu.data[UCSR0A] & UDRE).toEqual(0);
@@ -163,6 +164,7 @@ describe('USART', () => {
       cpu.data[SREG] = 0x80; // SREG: I-------
       cpu.cycles = 1e6;
       usart.tick();
+      cpu.tick();
       expect(cpu.pc).toEqual(PC_INT_TXC);
       expect(cpu.cycles).toEqual(1e6 + 2);
       expect(cpu.data[UCSR0A] & TXC).toEqual(0);
@@ -174,6 +176,7 @@ describe('USART', () => {
       cpu.writeData(UCSR0B, TXCIE | TXEN);
       cpu.data[SREG] = 0x80; // SREG: I-------
       usart.tick();
+      cpu.tick();
       expect(cpu.pc).toEqual(0);
       expect(cpu.cycles).toEqual(0);
     });
@@ -186,6 +189,7 @@ describe('USART', () => {
       cpu.data[SREG] = 0; // SREG: 0 (disable interrupts)
       cpu.cycles = 1e6;
       usart.tick();
+      cpu.tick();
       expect(cpu.pc).toEqual(0);
       expect(cpu.cycles).toEqual(1e6);
       expect(cpu.data[UCSR0A]).toEqual(TXC | UDRE);
@@ -244,9 +248,11 @@ describe('USART', () => {
       cpu.writeData(UDR0, 0x48); // 'H'
       cpu.cycles += 16000; // 1ms
       usart.tick();
+      cpu.tick();
       expect(cpu.data[UCSR0A] & TXC).toEqual(0);
       cpu.cycles += 800; // 0.05ms
       usart.tick();
+      cpu.tick();
       expect(cpu.data[UCSR0A] & TXC).toEqual(TXC);
     });
   });