Datasheet

CHAPTER 7 8-BIT TIMER H1

User’s Manual U18172EJ3V0UD

136

(2) Port mode register 2 (PM2) and port mode control register 2 (PMC2)

Note

When using the P20/TOH1/TI000/ANI0 pin for timer output, clear PM20, the output latch of P20, and PMC20 to 0.

PM2 and PMC2 can be set by a 1-bit or 8-bit memory manipulation instruction.

Reset signal generation sets PM2 to FFH, and clears PMC2 to 00H.

Note

PD78F920x only

Figure 7-5. Format of Port Mode Register 2 (PM2)

Address: FF22H After reset: FFH R/W

Symbol 7 6 5 4 3 2 1 0

PM2 1 1 1 1 PM23 PM22 PM21 PM20

PM2n P2n pin I/O mode selection (n = 0 to 3)

0 Output mode (output buffer on)

1 Input mode (output buffer off)

Figure 7-6. Format of Port Mode Control Register 2 (PMC2) (

PD78F920x Only)

Address: FF84H After reset: 00H R/W

Symbol 7 6 5 4 3 2 1 0

PMC2 0 0 0 0 PMC23 PMC22 PMC21 PMC20

PMC2n Specification of operation mode (n = 0 to 3)

0 Port/Alternate-function (except A/D converter) mode

1 A/D converter mode

7.4 Operation of 8-Bit Timer H1

7.4.1 Operation as interval timer/square-wave output

When 8-bit timer counter H1 and compare register 01 (CMP01) match, an interrupt request signal (INTTMH1) is

generated and 8-bit timer counter H1 is cleared to 00H.

Compare register 11 (CMP11) is not used in interval timer mode. Since a match of 8-bit timer counter H1 and the

CMP11 register is not detected even if the CMP11 register is set, timer output is not affected.

By setting bit 0 (TOEN1) of timer H mode register 1 (TMHMD1) to 1, a square wave of any frequency (duty = 50%)

is output from TOH1.

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