
Enhanced Serial Communications Interface (ESCI) Module
MC68HC908QC16 MC68HC908QC8 MC68HC908QC4 Data Sheet, Rev. 5
124
Freescale Semiconductor
Figure 13-1. Block Diagram Highlighting ESCI Block and Pins
All port pins can be configured with internal pullup
PTC not available on 16-pin devices (see note in
11.1 Introduction)PTA0/T1CH0/AD0/KBI0
PTA1/T1CH1/AD1/KBI1
PTA2/IRQ/KBI2/T1CLK
PTA3/RST/KBI3
PTA4/OSC2/AD2/KBI4
PTA5/OSC1/AD3/KBI5
4-CHANNEL 16-BIT
TIMER MODULE
KEYBOARD INTERRUPT
MODULE
SINGLE INTERRUPT
MODULE
PERIODIC WAKEUP
LOW-VOLTAGE
INHIBIT
COP
MODULE
10-CHANNEL
10-BIT ADC
ENHANCED SERIAL
PTB0/SPSCK/AD4
PTB
DDRB
M68HC08 CPU
PTA
DDRA
PTB1/MOSI/T2CH1/AD5
PTB2/MISO/T2CH0/AD6
PTB3/SS/T2CLK/AD7
PTB4/RxD/T2CH0/AD8
PTB5/TxD/T2CH1/AD9
PTB6/T1CH2
PTB7/T1CH3
POWER SUPPLY
VDD
VSS
CLOCK
GENERATOR
COMMUNICATIONS
INTERFACE MODULE
MODULE
SERIAL PERIPHERAL
INTERFACE
16,384 BYTES
MC68HC908QC16
8192 BYTES
MC68HC908QC8
512 BYTES
MC68HC908QC16
384 BYTES
MC68HC908QC8
BREAK
MODULE
MONITOR ROM
2-CHANNEL 16-BIT
TIMER MODULE
PTC0
PTC1
PTC2
PTC3
PTC
DDRC
PTD0
PTD
DDRD
PTD1
PTD2
PTD3
PTD4
PTD5
PTD6
PTD7
MC68HC908QC4
USER RAM
USER FLASH
4096 BYTES
384 BYTES
MC68HC908QC4