TMP89FS60 datasheet(190/410 Pages) TOSHIBA

190 / 410 page

Page 176

14. 8-bit Timer Counter (TC0)

TMP89FS60

RA002

If the value set to T00REG is smaller than the up counter value, the match detection is exe-

cuted using a new set value after the up counter overflows. Therefore, the interrupt request

interval may be longer than the selected time. If the value set to T00REG is equal to the up

counter value, the match detection is executed immediately after data is written into T00REG.

Therefore, the interrupt request interval may not be an integral multiple of the source clock

(Figure 14-3). If these are problems, enable the double buffer.

When a write instruction is executed on T00REG while the timer is stopped, the set value is

immediately stored in T00REG.

When a read instruction is executed on T00REG, the last value written into T00REG is read out, regard-

less of the T00MOD<DBE0> setting.

Table 14-5 8-bit Timer Mode Resolution and Maximum Time Setting

T00MOD

<TCK0>

Source clock [Hz]

Resolution

Maximum time setting

NORMAL1/2 or IDLE1/2 mode

SLOW1/2 or

SLEEP1 mode

fcgck=8MHz

fs=32.768KHz

fcgck=8MHz

fs=32.768KHz

SYSCR1<DV9CK>

= "0"

SYSCR1<DV9CK>

= "1"

000

fcgck/211

fs/24

256

µs488.2µs

65.3ms

124.5ms

001

fcgck/210

fs/23

128

µs244.1µs

32.6ms

62.3ms

010

fcgck/28

-32

µs

8.2ms

011

fcgck/26

-8

µs

2.0ms

100

fcgck/24

-2

µs

510

µs-

101

fcgck/22

500ns

127.5

µs-

110

fcgck/2

250ns

63.8

µs-

111

fcgck

fs/22

125ns

122.1

µs31.9µs31.1ms

(Example) Operate TC00 in the 8-bit timer mode with the operation clock of fcgck/22 [Hz] and generate interrupts at 64

µs intervals

(fcgck = 8 MHz)

(POFFCR0),0x10

; Sets TC001EN to "1"

; Sets the interrupt master enable flag to "disable"

SET

(EIRH).4

; Sets the INTTC00 interrupt enable register to "1"

; Sets the interrupt master enable flag to "enable"

(T00MOD),0xE8

; Selects the 8-bit timer mode and fcgck/22

(T00REG),0x80

; Sets the timer register (64

µs / (22/fcgck) = 0x80)

SET

(T001CR).0

; Starts TC00

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