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| TMP93CS40 Datasheet, PDF (143/248 Pages) Toshiba Semiconductor – CMOS 16-Bit Microcontroller | |||
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TMP93CS40/TMP93CS41
1. Prescaler
There are 9-bit prescaler and prescaler clock-selection registers to generate input clock
signals for 8-bit timers 0 and 1, 16-bit timers 4 and 5, and serial interfaces 0 and 1.
Figure 3.9.11 shows the block diagram. Table 3.9.1 shows prescaler clock resolution into
8-/16-bit timers.
fFPH
2
24
fs
XT1
SYSCR0
<PRCK1:0>
Run/stop
& clear
TRUN<PRRUN>
SYSCR1<SYSCK>
fc fc/2 fc/4 fc/8 fc/16
SYSCR1<GEAR2:0>
X1
÷2 ÷4 ÷8 ÷16
To CPU
To 8-bit PWM prescaler
9-bit prescaler
2 4 8 16 32 64 128 256 512
ÏT1
ÏT4
ÏT16
ÏT256
To 8-bit timers 0 and
1
ÏT1
ÏT4
ÏT16
To 16-bit timers 4 and
5
Ï1
2
ÏT0
ÏT2
ÏT8
To serial interfaces
0 and 1
ÏT32
Figure 3.9.11 Block Diagram of Prescaler
Table 3.9.1 Prescaler Clock Resolution into 8-/16-Bit Timers
at fc = 20 MHz, fs = 32.768 kHz
Select Select Prescaler Clock Gear Value
System Clock
<SYSCK>
<PRCK1:0>
<GEAR2:0>
Prescaler Clock Resolution
ÏT1
ÏT4
ÏT16
ÏT256
1 (fs)
0 (fc)
XXX
XXX
00
(fFPH)
01
(Low-frequency clock)
10
(fc/16 clock)
XXX
000 (fc)
001 (fc/2)
010 (fc/4)
011 (fc/8)
100 (fc/16)
XXX
XXX
fs/23 (244 µs)
fc/23 (0.4 µs)
fc/24 (0.8 µs)
fc/25 (1.6 µs)
fc/26 (3.2 µs)
fc/27 (6.4 µs)
fs/23 (244 µs)
fs/25 (977 µs)
fc/25 (1.6 µs)
fc/26 (3.2 µs)
fc/27 (6.4 µs)
fc/28 (12.8 µs)
fc/29 (25.6 µs)
fs/27 (3.9 ms) fs/211 (62.5 ms)
fc/27 (6.4 µs) fc/211 (102.4 µs)
fc/28 (12.8 µs) fc/212 (204.8 µs)
fc/29 (25.6 µs) fc/213 (409.6 µs)
fc/210 (51.2 µs) fc/214 (819.2 ms)
fc/211 (102.4 µs) fc/215 (1.64 ms)
fs/25 (977 µs) fs/27 (3.9 ms) fs/211 (62.5 ms)
fc/27 (6.4 µs) fc/29 (25.6 µs) fc/211 (102.4 µs) fc/215 (1.64 ms)
XXX: Donât care
Note: The fc/16 clock cannot be used as a prescaler
clock when the fs is used as a system clock.
16-bit timer
8-bit timer
93CS40-141
2004-02-10
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