HD6433832S Datasheet, PDF (213/560 Pages) Renesas Technology Corp – single-chip microcomputers

TCF is a 16-bit read/write up-counter consisting of two cascaded 8-bit timer counters, TCFH and
TCFL. TCF can be used as a 16-bit counter, with TCFH as the upper 8 bits and TCFL as the lower
8 bits of the counter, or TCFH and TCFL can be used as independent 8-bit counters.
TCFH and TCFL can be read and written by the CPU, but in 16-bit mode, data transfer with the
CPU takes place via a temporary register (TEMP). For details see 9.5.3, Interface with the CPU.
Upon reset, TCFH and TCFL are each initialized to H'00.
• 16-bit mode (TCF)
16-bit mode is selected by clearing bit CKSH2 to 0 in timer control register F (TCRF). The
TCF input clock is selected by TCRF bits CKSL2 to CKSL0.
Timer control status register F (TCSRF) can be set so that counter TCF will be cleared by
compare match.
When TCF overflows from H'FFFF to H'0000, the overflow flag (OVFH) in TCSRF is set to 1.
If bit OVIEH in TCSRF is set to 1 when an overflow occurs, bit IRRTFH in interrupt request
register 2 (IRR2) will be set to 1; and if bit IENTFH in interrupt enable register 2 (IENR2) is
set to 1, a CPU interrupt will be requested.
• 8-bit mode (TCFH, TCFL)
When bit CKSH2 in timer control register F (TCRF) is set to 1, timer F functions as two
separate 8-bit counters, TCFH and TCFL. The TCFH (TCFL) input clock is selected by TCRF
bits CKSH2 to CKSH0 (CKSL2 to CKSL0).
TCFH (TCFL) can be cleared by a compare match signal. This designation is made in bit
CCLRH (CCLRL) in TCSRF.
When TCFH (TCFL) overflows from H'FF to H'00, the overflow flag OVFH (OVFL) in
TCSRF is set to 1. If bit OVIEH (OVIEL) in TCSRF is set to 1 when an overflow occurs, bit
IRRTFH (IRRTHL) in interrupt request register 2 (IRR2) will be set to 1; and if bit IENTFH
(IENTFL) in interrupt enable register 2 (IENR2) is set to 1, a CPU interrupt will be requested.
16-Bit Output Compare Register (OCRF)
8-Bit Output Compare Register (OCRFH)
8-Bit Output Compare Register (OCRFL)
OCRF
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Initial value
Read/Write
1111111111111111
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
OCRFH
OCRFL
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