HD6473258P10V Datasheet, PDF (161/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

8.2.2 Time Constant Registers A and B (TCORA and TCORB) – H’FFCA and H’FFCB
(TMR0), H’FFD2 and H’FFD3 (TMR1)
Bit
7
6
5
4
3
2
1
0
Initial value
Read/Write
1
1
1
1
1
1
1
1
R/W R/W R/W R/W R/W R/W R/W R/W
TCORA and TCORB are 8-bit readable/writable registers. The timer count is continually
compared with the constants written in these registers. When a match is detected, the
corresponding compare-match flag (CMFA or CMFB) is set in the timer control/status register
(TCSR).
The timer output signal (TMO0 or TMO1) is controlled by these compare-match signals as
specified by output select bits 3 to 0 (OS3 to OS0) in the timer control/status register (TCSR).
TCORA and TCORB are initialized to H’FF at a reset and in the standby modes.
Compare-match is not detected during the T3 state of a write cycle to TCORA or TCORB. See
item (3) in section 8.6, Application Notes.
8.2.3 Timer Control Register (TCR) – H’FFC8 (TMR0), H’FFD0 (TMR1)
Bit
Initial value
Read/Write
7
6
CMIEB CMIEA
0
0
R/W R/W
5
OVIE
0
R/W
4
3
CCLR1 CCLR0
0
0
R/W R/W
2
CKS2
0
R/W
1
CKS1
0
R/W
0
CKS0
0
R/W
TCR is an 8-bit readable/writable register that selects the clock source and the time at which the
timer counter is cleared, and enables interrupts.
TCR is initialized to H’00 at a reset and in the standby modes.
Bit 7 – Compare-match Interrupt Enable B (CMIEB): This bit selects whether to request
compare-match interrupt B (CMIB) when compare-match flag B (CMFB) in the timer
control/status register (TCSR) is set to 1.
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