MC908AZ32ACFU Freescale Semiconductor, MC908AZ32ACFU Datasheet - Page 227

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MC908AZ32ACFU

Manufacturer Part Number
MC908AZ32ACFU
Description
IC MCU 32K FLASH 8.4MHZ 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC908AZ32ACFU

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
40
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 15x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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20.7.2 TIM Counter Registers
The two read-only PIT counter registers contain the high and low bytes of the value in the PIT counter.
Reading the high byte (PCNTH) latches the contents of the low byte (PCNTL) into a buffer. Subsequent
reads of PCNTH do not affect the latched PCNTL value until PCNTL is read. Reset clears the PIT counter
registers. Setting the PIT reset bit (PRST) also clears the PIT counter registers.
20.7.3 TIM Counter Modulo Registers
The read/write PIT modulo registers contain the modulo value for the PIT counter. When the PIT counter
reaches the modulo value the overflow flag (POF) becomes set and the PIT counter resumes counting
from $0000 at the next clock. Writing to the high byte (PMODH) inhibits the POF bit and overflow
interrupts until the low byte (PMODL) is written. Reset sets the PIT counter modulo registers.
Freescale Semiconductor
Reset:
Address: $004C
Address: $004D
Address: $004E:$004F
Address: $004E:$004F
If you read PCNTH during a break interrupt, be sure to unlatch PCNTL by
reading PCNTL before exiting the break interrupt. Otherwise, PCNTL
retains the value latched during the break
Reset the PIT counter before writing to the PIT counter modulo registers.
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Figure 20-5. PIT Counter Modulo Registers (PMODH–PMODL)
Bit 15
Bit 15
Bit 15
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Figure 20-4. PIT Counter Registers (PCNTH–PCNTL)
0
0
1
1
= Unimplemented
14
14
14
6
0
6
0
6
1
6
6
1
MC68HC908AZ32A Data Sheet, Rev. 2
13
13
13
5
0
5
0
5
1
5
5
1
NOTE
NOTE
12
12
12
4
0
4
0
4
1
4
4
1
11
11
11
3
0
3
0
3
1
3
3
1
10
10
10
2
0
2
0
2
1
2
2
1
1
9
0
1
9
0
1
9
1
1
1
1
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 0
0
0
1
1
I/O Registers
227

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