HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 231

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

11.1.3 Input and Output Pins
Table 11-1 lists the input and output pins of the 8-bit timer.
Table 11-1 Input and Output Pins of 8-Bit Timer
Name
Timer output
Timer clock input
Timer reset input
11.1.4 Register Configuration
Table 11-2 lists the registers of the 8-bit timer.
Table 11-2 8-Bit Timer Registers
Name
Timer control register
Timer control/status register
Timer constant register A
Timer constant register B
Timer counter
* Software can write a 0 to clear bits 7 to 5, but cannot write a 1 in these bits.
11.2 Register Descriptions
11.2.1 Timer Counter (TCNT)—H'FED4
Bit
Initial value
Read/Write
The timer counter (TCNT) is an 8-bit up-counter that increments on a pulse generated from one of
four clock sources. The clock source is selected by clock select bits 2 to 0 (CKS2 to CKS0) of the
timer control register (TCR). The CPU can always read or write the timer counter.
R/W
7
0
Abbreviation
TMO
TMCI
TMRI
R/W
6
0
Abbreviation
TCR
TCSR
TCORA
TCORB
TCNT
R/W
5
0
I/O
Output
Input
Input
215
R/W
R/W
R/W
R/(W)*
R/W
R/W
R/W
4
0
Function
Output controlled by compare-match
External clock source for the counter
External reset signal for the counter
R/W
3
0
Initial Value
H'00
H'10
H'FF
H'FF
H'00
R/W
2
0
Address
H'FED0
H'FED1
H'FED2
H'FED3
H'FED4
R/W
1
0
R/W
0
0