參數(shù)資料
型號(hào): MC68334GVFC16
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
封裝: PLASTIC, QFP-132
文件頁數(shù): 54/76頁
文件大小: 444K
代理商: MC68334GVFC16
MOTOROLA
MC68334
58
MC68334TS/D REV. 1
Figure 12 Prescaler Control 1
TCR2P — Timer Count Register 2 Prescaler Control
TCR2 is clocked from the output of a prescaler. If T2CG = 0, the input to the TCR2 prescaler is the ex-
ternal TCR2 clock source. If T2CG = 1, the input is the TPU system clock divided by eight. The TCR2P
field specifies the value of the prescaler: 1, 2, 4, or 8. Channels using TCR2 have the capability to re-
solve down to the TPU system clock divided by 8. The following table is a summary of prescaler output.
EMU — Emulation Control
In emulation mode, the TPU executes microinstructions from MCU TPURAM exclusively. Access to the
TPURAM module through the IMB by a host is blocked, and the TPURAM module is dedicated for use
by the TPU. After reset, this bit can be written only once.
0 = TPU and TPURAM not in emulation mode
1 = TPU and TPURAM in emulation mode
T2CG — TCR2 Clock/Gate Control
When the T2CG bit is set, the external TCR2 pin functions as a gate of the DIV8 clock (the TPU system
clock divided by 8). In this case, when the external TCR2 pin is low, the DIV8 clock is blocked, prevent-
ing it from incrementing TCR2. When the external TCR2 pin is high, TCR2 is incremented at the fre-
quency of the DIV8 clock. When T2CG is cleared, an external clock from the TCR2 pin, which has been
synchronized and fed through a digital filter, increments TCR2.
0 = TCR2 pin used as clock source for TCR2
1 = TCR2 pin used as gate of DIV8 clock for TCR2
PSCK = 0
PSCK = 1
TCR1 Prescaler
Divide
By
Number of
Clocks
Rate at
16 MHz
Number of
Clocks
Rate at
16 MHz
00
1
32
2 ms
4
250 ns
01
2
64
4 ms
8
500 ns
10
4
128
8 ms
16
1 ms
11
8
256
16 ms
32
2 ms
TCR2 Prescaler
Divide By
Internal Clock
Divided By
External Clock
Divided By
00
181
012162
104324
118648
TPU PRE BLOCK 1
TCR1
015
÷ 4
DIV4 CLOCK
÷ 32
DIV32 CLOCK
TCR1
PRESCALER
00
÷ 1
01
÷ 2
10
÷ 4
11
÷ 8
SYSTEM
CLOCK
0 – DIV32 CLOCK
1 – DIV4 CLOCK
÷ 2
DIV2 CLOCK
0 – TCR1 PRESCALER
1 – DIV2
PSCK
MUX
CSEL
MUX
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