107
CHAPTER 6 16-BIT TIMER 0 TM0
Preliminary User’s Manual U14581EJ3V0UM00
(3) Prescaler mode register (PRM0)
This register is used to set TM0 count clock and valid edge of TI00 to TI02 input.
PRM0 is set with an 8-bit memory manipulation instruction.
RESET input clears PRM0 to 00H.
Figure 6-4. Prescaler Mode Register (PRM0) Format
Address: FF70H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
PRM0
ES21
ES20
ES11
ES10
ES01
ES00
PRM01
PRM00
ESn1
ESn0
TI0n Valid Edge Selection
0
0
Falling edge
0
1
Rising edge
1
0
Setting prohibited
1
1
Both falling and rising edges
PRM01
PRM00
Count Clock Selection
0
0
f
X
/2
3
0
1
f
X
/2
4
1
0
f
X
/2
5
1
1
f
X
/2
6
Caution
Timer operation must be stopped before setting PRM0.
Remarks 1. f
X
: Main system clock oscillation frequency.
2. n = 0 to 2
(4) Port mode register 4 (PM4)
This register sets port 4 to the input or output mode in 1-bit units.
To use the P40/TI00 to P42/TI02 pins as timer input pins, set PM40 to PM42 to 1. PM4 is set with a 1-bit or
8-bit memory manipulation instruction.
RESET input sets PM4 to FFH.
Figure 6-5. Port Mode Register 4 (PM4) Format
Address: FF24H After Reset: FFH R/W
Symbol
7
6
5
4
3
2
1
0
PM4
1
1
1
PM44
PM43
PM42
PM41
PM40
PM4n
P4n Pin I/O Mode Selection (n = 0 to 4)
0
Output mode (output buffer on)
1
Input mode (output buffer off)
Содержание mPD780851
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