Enhanced Serial Communications Interface (ESCI) Module
MC68HC908GT16 MC68HC908GT8 MC68HC08GT16 Data Sheet, Rev. 5.0
150
Freescale Semiconductor
Figure 14-1. Block Diagram Highlighting ESCI Block and Pins
Table 14-1. Pin Name Conventions
Generic Pin Names
RxD
TxD
Full Pin Names
PTE1/RxD
PTE0/TxD
SINGLE BREAKPOINT BREAK
MODULE
INTERNAL CLOCK
GENERATOR MODULE
SYSTEM INTEGRATION
MODULE
PROGRAMMABLE TIMEBASE
MODULE
MONITOR MODULE
SERIAL PERIPHERAL
INTERFACE MODULE
2-CHANNEL TIMER INTERFACE
MODULE 2
DUAL VOLTAGE
LOW-VOLTAGE INHIBIT MODULE
8-BIT KEYBOARD
INTERRUPT MODULE
ARITHMETIC/LOGIC
UNIT (ALU)
CPU
REGISTERS
M68HC08 CPU
CONTROL AND STATUS
REGISTERS — 64 BYTES
USER FLASH
USER RAM — 512 BYTES
MONITOR ROM — 304 BYTES
USER FLASH VECTOR SPACE — 36 BYTES
SINGLE EXTERNAL
INTERRUPT MODULE
P
D
D
P
D
P
D
P
INTERNAL BUS
PTE4/OSC1
PTE3/OSC2
RST
(3)
IRQ
(3)
COMPUTER OPERATING
PROPERLY MODULE
PTA7/KBD7–
PTA0/KBD0
(1)
PTB7/AD7
PTB6/AD6
PTB5/AD5
PTB4/AD4
PTB3/AD3
PTB2/AD2
PTB1/AD1
PTB0/AD0
8-BIT ANALOG-TO-DIGITAL
CONVERTER MODULE
PTC6
(1)
PTC5
(1)
PTC4
(1)(2)
PTC3
(1)(2)
PTC2
(1)(2)
PTC1
(1)(2)
PTC0
(1)(2)
PTD7/T2CH1
(1)
PTD6/T2CH0
(1)
PTD5/T1CH1
(1)
PTD4/T1CH0
(1)
PTD3/SPSCK
(1)
PTD2/MOSI
(1)
PTD1/MISO
(1)
PTD0/SS
(1)
PTE1/RxD
PTE0/TxD
2-CHANNEL TIMER INTERFACE
MODULE 1
SERIAL COMMUNICATIONS
INTERFACE MODULE
POWER-ON RESET
MODULE
MEMORY MAP
MODULE
CONFIGURATION REGISTER 1
MODULE
SECURITY
MODULE
CONFIGURATION REGISTER 2
MODULE
POWER
V
SS
V
DDA
V
DD
V
SSA
1. Ports are software configurable with pullup device if input port.
2. Higher current drive port pins
3. Pin contains integrated pullup device
MONITOR MODE ENTRY
MODULE
D
P
V
REFH
V
REFL
PTE2
FLASH PROGRAMMING ROUTINES
ROM — 720 BYTES
MC68HC908GT16 — 15,872 BYTES
MC68HC908GT8 — 7,680 BYTES