GMS81508B HYNIX [Hynix Semiconductor], GMS81508B Datasheet - Page 54

• Manufacturer Part Number: GMS81508B
• Description: HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: HYNIX [Hynix Semiconductor]

HYUNDAI MicroElectronics
13.3 The method of Serial I/O
1. Select transmission/receiving mode.
2. In case of sending mode, write data to be send to SIOR.
3. Set SIOST to “1” to start serial transmission.
4. The SIO interrupt is generated at the completion of SIO
5. In case of receiving mode, the received data is acquired
13.4 The Method to Test Correct Transmission
DEC. 1999 Ver 1.04
and SIOSF is set to “1”. In SIO interrupt service routine,
correct transmission should be tested.
by reading the SIOR.
Figure 13-4 Serial Method to Test Transmission
- SE: Interrupt Enable Register Low IENL(Bit3)
- SR: Interrupt Request Flag Register Low IRQL(Bit3)
Serial I/O Interrupt
Service Routine
Normal Operation
Write SIOM
SIOSF
SE = 0
SR
1
1
0
0
Note: When external clock is used, the frequency should
be less than 1MHz and recommended duty is 50%. If both
transmission mode is selected and transmission is per-
formed simultaneously it would be made error.
Overrun Error
Abnormal
GMS81508B/16B/24B
51