SH7052 datasheet(235/919 Pages) RENESAS

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10.2.3

Timer Control Registers (TCR)

The timer control registers (TCR) are 8-bit registers. The ATU-II has 16 TCR registers: two each

for channels 1 and 2, one each for channels 3, 4, 5, 8, and 11, two each for channels 6 and 7, and

three for channel 9. For details of channel 10, see section 10.2.26, Channel 10 Registers.

Channel

Abbreviation

Function

TCR1A, TCR1B

Internal clock/external clock/TI10 input clock selection

TCR2A, TCR2B

TCR3

TCR4

TCR5

TCR6A, TCR6B

Internal clock selection

TCR7A, TCR7B

TCR8

TCR9A, TCR9B,

TCR9C

External clock selection/setting of channel 3 trigger in event of

compare-match

TCR11

Internal clock/external clock selection

Each TCR is an 8-bit readable/writable register that selects whether an internal clock or external

clock is used for channels 1 to 5 and 11. For channels 6 to 8, TCR selects an internal clock, and for

channel 9, an external clock.

When an internal clock is selected, TCR selects the value of

φ" further scaled from clock φ' scaled

with prescaler register 1 (PSCR1). Scaled clock

φ" can be selected, for channels 1 to 8 and 11

only, from

φ', φ'/2, φ'/4, φ'/8, φ'/16, and φ'/32 (only φ' is available for channel 0). Edge detection is

performed on the rising edge.

When an external clock is selected, TCR selects whether TCLKA, TCLKB (channels 1 to 5 and 11

only), TI10 pin input (channels 1 to 5 only), or a TI10 pin input multiplied clock (channels 1 to 5

only) is used, and also performs edge selection.

Each TCR is initialized to H'00 by a power-on reset, and in hardware standby mode and software

standby mode.

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