UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 35

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

3.2.2 General-purpose registers
(AX, BC, DE, and HL).
names (R0 to R7 and RP0 to RP3).
A general-purpose register consists of eight 8-bit registers (X, A, C, B, E, D, L, and H).
In addition each register being used as an 8-bit register, two 8-bit registers in pairs can be used as a 16-bit register
Registers can be described in terms of function names (X, A, C, B, E, D, L, H, AX, BC, DE, and HL) and absolute
SP
SP + 1
SP + 2
SP
Lower half
register pairs
Upper half
register pairs
POP rp
instruction
15
Figure 3-10. General-Purpose Register Configuration (1/2)
Figure 3-9. Data to Be Restored from Stack Memory
16-bit processing
DE
BC
HL
AX
SP
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16898EJ5V0UD
SP + 1
SP + 2
(a) Function names
SP
0
RET instruction
PC15 to PC8
PC7 to PC0
7
8-bit processing
H
D
E
B
C
A
X
L
SP
SP + 1
SP + 2
SP + 3
SP
0
RETI instruction
PC15 to PC8
PC7 to PC0
PSW
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